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    Polyolefin process monitoring and control
    62.
    发明授权
    Polyolefin process monitoring and control 有权

    公开(公告)号：US11773198B2

    公开(公告)日：2023-10-03

    申请号：US17931103

    申请日：2022-09-09

    Applicant: Chevron Phillips Chemical Company LP

    Inventor： Paul J. DesLauriers ,  Jeff S. Fodor ,  Eric J. Netemeyer ,  Qing Yang

    IPC: C08F210/16 ,  C08F2/00

    CPC classification number: C08F210/16 ,  C08F2400/02

    Abstract: Methods of controlling olefin polymerization reactor systems may include a) selecting n input variables, each input variable corresponding to a process condition for an olefin polymerization process; b) identifying m response variables corresponding to a measurable polymer property; c) adjusting one of more of the n input variables using the olefin polymerization reactor system and measuring each of the m response variables as a function of the input variables for olefin polymers; d) analyzing the change in each of the response variables as a function of the input variables to determine coefficients; e) calculating a Response Surface Model (RSM) for each response variable determined in step d); f) applying n selected input variables to the calculated RSM to predict one or more of m target response variables; and g) using the n selected input variables to operate the olefin polymerization reactor system and provide a polyolefin product.

    METALLOCENE CATALYSTS FOR POLYETHYLENE
    68.
    发明申请
    METALLOCENE CATALYSTS FOR POLYETHYLENE 有权

    公开(公告)号：US20210261697A1

    公开(公告)日：2021-08-26

    申请号：US16797875

    申请日：2020-02-21

    Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP

    Inventor： Errun Ding ,  Qing Yang ,  Carlton E. Ash ,  Randall S. Muninger ,  Jim B. Askew ,  Zhou Chen

    IPC: C08F4/6592 ,  C08F10/02

    Abstract: Disclosed are metallocene compounds, catalyst compositions comprising a metallocene compound, processes for polymerizing olefins, methods for making catalyst compositions, olefin polymers and articles made from olefin polymers. In an aspect, a metallocene compounds contain a fluorenyl ligand and a cyclopentadienyl ligand which are bridged by a linking group, in which the metallocene is characterized by [1] the cyclopentadienyl ligand being substituted with a C2-C18 heterohydrocarbyl group having an oxygen atom positioned 5 atoms distance or less from the cyclopentadienyl ligand and [2] the linking group having a pendant C3-C12 alkenyl group having a terminal C═C double bond. It has been discovered that a catalyst composition comprising a metallocene compound having these features can produce polyethylene having a low melt index in the absence of a second metallocene.

    BIMODAL POLYETHYLENE COPOLYMERS
    69.
    发明申请
    BIMODAL POLYETHYLENE COPOLYMERS 有权

    公开(公告)号：US20210147661A1

    公开(公告)日：2021-05-20

    申请号：US17160481

    申请日：2021-01-28

    Applicant: Chevron Phillips Chemical Company LP

    Inventor： Graham R. Lief ,  Qing Yang ,  Youlu Yu

    IPC: C08L23/08 ,  C08F2/34 ,  C08F4/6592 ,  C08F4/659 ,  C08F210/16

    Abstract: Ethylene-based polymers are characterized by a density from 0.92 to 0.955 g/cm3, a HLMI of less than 35 g/10 min, and a ratio of a number of short chain branches (SCBs) per 1000 total carbon atoms at Mz to a number of SCBs per 1000 total carbon atoms at Mn in a range from 11.5 to 22. These polymers can have a higher molecular weight (HMW) component and a lower molecular weight (LMW) component, in which a ratio of a number of SCBs per 1000 total carbon atoms at Mn of the HMW component to a number of SCBs per 1000 total carbon atoms at Mn of the LMW component is in a range from 10.5 to 22. These ethylene polymers can be produced using a dual catalyst system containing an unbridged metallocene compound with an indenyl group having at least one halogen-substituted hydrocarbyl substituent with at least two halogen atoms, and a single atom bridged metallocene compound with a fluorenyl group and a cyclopentadienyl group.

    Dual Catalyst System for Producing High Density Polyethylenes With Long Chain Branching
    70.
    发明申请
    Dual Catalyst System for Producing High Density Polyethylenes With Long Chain Branching 有权

    公开(公告)号：US20210139619A1

    公开(公告)日：2021-05-13

    申请号：US17142312

    申请日：2021-01-06

    Applicant: Chevron Phillips Chemical Company LP

    Inventor： Errun Ding ,  Qing Yang ,  Randall S. Muninger ,  Youlu Yu ,  Yongwoo Inn

    IPC: C08F10/02 ,  C08F2/34 ,  C08F4/6592

    Abstract: Disclosed herein are ethylene-based polymers generally characterized by a melt index of less than 1 g/10 min, a density from 0.93 to 0.965 g/cm3, a CY-a parameter at 190° C. of less than 0.2, an average number of short chain branches per 1000 total carbon atoms of the polymer in a molecular weight range of 400,000 to 600,000 g/mol that is greater than that in a molecular weight range of 40,000 to 60,000 g/mol, and an average number of long chain branches per 1000 total carbon atoms of the polymer in a molecular weight range of 400,000 to 600,000 g/mol that is greater than that in a molecular weight range of 4,000,000 to 6,000,000 g/mol. The ethylene polymers can be used to fabricate pipes, blown films, and blow molded products, and the ethylene polymers can be produced with a dual catalyst system containing a single atom bridged or two carbon atom bridged metallocene compound with two indenyl groups or an indenyl group and a cyclopentadienyl group, and a single atom bridged metallocene compound with a fluorenyl group and a cyclopentadienyl group with an alkenyl substituent.

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